Sluggish SBS 2011 connection

Hi,
I installed an SBS 2011 Essentials server in a company's network, replacing the old SBS 2003 server.
All pc's are working a bit faster with this (mostly) file-server, except one pc.
When I replace the connection of the f: to the same map on the new server the speed is 2 times slower (and even more) then it was connected to the old server. Just can't think of a possible solution but trying to get the latest driver for the NIC.
The old server is still running so I can do the trick with the f: again, the difference is quite remarkable.
Anyone in for this?
TIA
Sjors

Odd that it's only one PC. Try copying a file of several MB with Robocopy to test the connection speed - Robocopy has a nice little summary after copying.
Robocopy is standard on most PCs and can be downloaded from MS if required. You need to run it from a command prompt.

Tests to run.
1. Copy from the PC to server A.
2. Copy from the PC to server B.
3. Copy from server A to the PC.
4. Copy from server B to the PC.
5. Copy from server B to server A.
This will tell you where the bottleneck is.
You can create a large test file using this command: fsutil file createnew <filename> <length>. e.g. A 10MB file = fsutil file createnew 10MBfile.dat 10485760
You don't need to map drives to use Robocopy, just specify the UNC, e.g. \\server\C$\Temp

Note: you need to delete the file from the destination before copying because Robocopy won't replace an existing file unless it's older.

Hi Paul, just tried as you suggested.
1. Copy from the PC to server A. 0:03
2. Copy from the PC to server B. 0:03
3. Copy from server A to the PC. 0:02
4. Copy from server B to the PC. 0:34
5. Copy from server B to server A. 0:37
6. Copy from server A to server B. 0:05

Where A is the one with SBS 2003 and
B the one with SBS 2011 Essentials

A remarkable difference, isn't it?
And the problem must be at the SBS 2011, I gather.
Although other aren't complaining.

The PC to server copies are the same speed so it's not conclusive. Try a 100MByte file - the network is 100Mbit/s so it's about 10 seconds to move that much data.
Perform tests 1 to 4 from the PC to be sure we are looking at data movement instigated by the PC.

tnx Joe, will look into that. But disable it on the new server or on the pc?
Paul, these are the results with a 700mb file:
from pc to server A 1:23
from pc to server B: 1:26
from server A to pc: 1:17
from server B to pc: 15:41
Now, if that isn't conclusive ;-)

meaning also on the pc's that don't have the problem? including the server of course. Do I use the MS Fixit for that or rather through HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic es\Tcpip6\Parameters \ and DisabledComponents on